An acronym for a 'cool' person - it stands for: Funny - Interesting - Different - Cool - Unique - Amazing.
Used by many who wish to describe their friends in a funny, interesting, different, cool, unique and amazing way.
This word can be used as a substitute for any of the above words that make up the acronym.

"Haha, that was such a FIDUCA thing to do!"
"Wow, your'e FIDUCA."
"Because of what you just did...I now see you as a totally FIDUCA person."